My sister, Ellen Davidson, died unexpectedly in her sleep Wednesday morning at age 77. No information yet about cause of death, although she did have Parkinson’s, so that may be it. If you knew her, you realize that she was a math teacher, a craftsperson, a world traveler, an organizer, a political activist, and a devoted mother and grandmother, but for me she will always be my sister.

Categories: Life, Math, Teaching & Learning, Travel